glass type
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2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Leonid Anatolevich Olenev ◽  
Rafina Rafkatovna Zakieva ◽  
Nina Nikolaevna Smirnova ◽  
Rustem Adamovich Shichiyakh ◽  
Kirill Aleksandrovich Ershov ◽  
...  

Purpose This study aims to present a more accurate lifetime prediction model considering solder chemical composition. Design/methodology/approach Thermal cycling and standard creep tests as well as finite element simulation were used. Findings The study found lower error in the solder joint lifetime evaluation. The higher the Ag content is, the higher the lifetime is achieved. Originality/value It is confirmed.


Author(s):  
Seong Soo Choi ◽  
Myoung Jin Park ◽  
Kyoung jin Kim ◽  
Yong Min Lee ◽  
Byung Seong Bae ◽  
...  
Keyword(s):  

2021 ◽  
Vol 280 ◽  
pp. 09018
Author(s):  
Oleg Levchenko ◽  
Olga Bezushko ◽  
Taras Maidanchuk ◽  
Anna Lukianenko ◽  
Olga Goncharova ◽  
...  

The results of investigations of chemical composition and emission rates of the welding fume, generated during welding using electrodes for copper alloys, are presented with the aim of improvement of their sanitary and hygienic characteristics. It is shown that in order to create new grades of welding electrodes with improved hygienic characteristics, it is necessary to have the data of the initial sanitary and hygienic evaluation in accordance with international standards. It was established that the use of binder based on pure lithium liquid glass in the coating of electrodes for welding copper alloys, increases the rate of welding fume emission into the air, as well as the content of manganese and copper oxides in it. The minimum rates of harmful emissions were recorded during the use of sodium-potassium binder, which is recommended for mass production of this type of electrodes.


2021 ◽  
Vol 263 ◽  
pp. 02045
Author(s):  
Dimitry Korolchenko ◽  
Younes Halloul

The issue of raising the level of safety of people, lands and property from potential threats in emergency situations in oil and gas storage and processing sites is particular concern to all levels of authority in countries, whether they are legal or executive authority. Study of the statistical data of incidents and fires at these equipment showed that the most negative effects for the damage to the company’s personnel, the population and the environment occurred during the quasi-instantaneous destruction of the vertical steel tank. The distinguishing features of such an accident are the complete loss of the integrity of the vertical oil tank hull and the release of all the liquid stored in the tank in the form of a powerful flow (breakout wave), which has a great destructive power, to the adjacent territory within a short term of time. The most important measures to reduce oil and petroleum products leakage in tank farms are reinforced earth dams and closed walls made of materials that are vulnerable to heat (important in the case of fire), Which led to many unsolvable cases. Recently, vertical steel tank with double walls of the “glass in a glass “type have been used in some oil tanks, in practice, they have not found wide application, which is due, first of all, it needs to allocate a significant territory for their arrangement, and its high cost.


2021 ◽  
Vol 54 (17) ◽  
pp. 145-148
Author(s):  
Margarita M. Preobrazhenskaia
Keyword(s):  

2021 ◽  
Vol 352 ◽  
pp. 00007
Author(s):  
Ján Brodniansky ◽  
Ľuboš Balcierák ◽  
Martin Magura ◽  
Ján Brodniansky

The paper presents testing of glass panels, static test and dynamic test by hard body impact. Pendulum test is presented. Test procedure is described as well as tested samples and their material characteristics. The glass type of tested samples were laminated and float glass, as well as the age of the glass samples were different.


2020 ◽  
Vol 64 (1-4) ◽  
pp. 1047-1055
Author(s):  
Hongli Ji ◽  
Junjun Jia ◽  
Chao Zhang ◽  
Chongcong Tao ◽  
Lu Yang ◽  
...  

The glass-type electrodes based pH sensors suffer from the weakness of fragility and poor stability in acid/alkali solution. To overcome these disadvantages, a novel solid-state pH sensor based on a RuO2–IrO2 H+ sensitive electrode via a polymeric precursor method was developed in this paper. The electrochemical performance of pH sensor was tested in different conditions. The experimental results showed that the sensitivity of the pH sensor could reach a high level of 52.0 mV/pH in a wide pH range of 2 ∼ 10. Furthermore, the response of pH sensor was fast and the response time remained less than 2.2 s even under varying pH conditions. The experiment was repeated three times during a period of time, the potential difference of pH sensor was between ±0.3 mV and ±0.9 mV in different pH value solutions, demonstrating its good stability, repeatability, recyclability and small potential drift. The negligible interference of Li+, Na+, K+, Ca2+, Mg2+, to the proposed pH sensor was also proven experimentally.


2020 ◽  
Vol 3 (3) ◽  
pp. 126-134
Author(s):  
Eko Julianto ◽  
Sunaryo Sunaryo ◽  
Elkana Bilak Lopo

The purpose of this study was to determine the shape change characteristics of float sheet glass using heat treatment experiments on its surface. This involved the use of a float glass type with a thickness of 5 mm, a width of 840 mm, and length of 1350 mm as the test specimen and the heat transfer experiments and treatment were conducted through conduction with the heat distribution recorded to be between 34 °C and 600 °C at every 5 minutes within 60 minutes in a heating furnace. The analysis focused on the characteristics of the glass surface exposed to fire with emphasis placed on the temperature during the deflection changes in the entire glass surface, the dimensional changes at the edges of the glass which follow the glass printing pattern, and the changes in temperature on the upper and lower surfaces of the curved glass mold. The results showed the existence of a very clear change in each temperature or conduction heat when the shape of the glass is changed to curve with the ideal shape observed to have changed at a temperature of 482.50 °C. Moreover, dimensional changes were 1.0427 m2 and the variations in the temperature were 107.55 °C and the continuous increase in the heat was to have led to a faster change in the glass shape by 11.2°. This, therefore, means a higher temperature or room temperature affects the firing rate of glass bending and also increases the rate of heat absorption.


2020 ◽  
Vol 843 ◽  
pp. 155942
Author(s):  
Wenwen Deng ◽  
Xiang Li ◽  
Weibo Shi ◽  
Qiuju Liu ◽  
Jiayue Jiang ◽  
...  

2020 ◽  
Vol 20 (07) ◽  
pp. 2050080
Author(s):  
Xiaokun Huang ◽  
Mingzhe Cui ◽  
Qiang Liu ◽  
Jianguo Nie

In this paper, the lateral torsional buckling (LTB) behavior of multi-layered long-span laminated glass (LG) beams is investigated through full-scale model test and numerical simulation. In the test program, the LG beams consisting of up to four glass plies and spanning 5000[Formula: see text]mm are constructed and tested. The load-displacement curves and development of strain in glass plies are recorded, based on which the deformation and stress state of buckled LG beams are analyzed, and the strength checking criterion is provided. The test results are also used to determine the shape and amplitude of initial imperfection through statistical analysis and to validate a numerical model based on the finite element method (FEM). Parametric analysis based on the FEM model is then conducted to investigate influential factors on the LTB resistance of LG beams, among which the influence of shape and amplitude of initial imperfection is emphasized. For the LTB design of LG beams, the applicability of existing formula to determine the critical buckling moment through effective stiffnesses is evaluated for multi-layered LG beams with the test and numerical results. Finally, the design buckling curves adopting the Ayrton–Perry formula (APF) are proposed and validated for LG beams categorized with glass type and load duration.


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